Applying HF and VHF/UHF Partial Discharge Detection for Distribution Transformer

Authors

  • Sakda Maneerot Department of Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand
  • Masaaki Kando Department of Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand
  • Norasage Pattanadech Department of Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand https://orcid.org/0000-0002-3897-1895

DOI:

https://doi.org/10.13052/jmm1550-4646.1545

Keywords:

capacitive sensor, antenna, electromagnetic transients, partial discharge, distribution transformer

Abstract

This paper represents application of high frequency (HF) and very high frequency/ultrahigh frequency (VHF/UHF) partial discharge (PD) detection for a distribution transformer. A capacitive sensor is used to detect the HF electric field caused by charge transfer inside oil–paper insulation due to PD at the defect site, and an electromagnetic sensor or antenna is used for detecting electromagnetic PD transients in the air outside the investigated transformer in the near-field region. Three types of artificial PD sources in air and insulating liquid, which are corona discharge, surface discharge and air void discharge in pressboard, were investigated. Three identical distribution transformers were rated at 22 kV, 400 V and 50 kVA, and were designed and constructed. The first transformer was filled with mineral oil, the second was filled with natural ester and the third was filled with palm oil. The PD generated by the air-filled voids in the insulating papers and pressboards of these transformers with five different conditions were investigated, i.e., non-impregnated paper, impregnated paper for 3 hours, 6 hours, 9 hours and 12 hours. The impregnation process was done with 65°C liquid temperature, and the pressure in the oven was around 5 mbar. From the experimental results, it can be concluded that the electromagnetic PD transients radiated from the corona discharge of both high-voltage (HV) and low-voltage sides in the air are in the VHF range, and surface discharge frequency is extended up to the UHF range. For the PD in the insulating liquid, the phase resolved PD (PRPD) pattern in the HF range is a valuable tool to characterize the PD sources. The PD in an air-filled void inside the insulating paper of the mineral oil transformer is obviously different compared with those of the natural ester transformer and the palm oil transformer. For the manufacturing of distribution transformers in this research, it is found that after the paper insulation is dried out, the impregnation process for a period of 9 hours is suitable for improving the oil–paper insulation with an acceptable PD level. This paper is the cross-field application by applying the antenna and communication theory for detecting the discharge problems in HV equipment.

Downloads

Download data is not yet available.

Author Biographies

Sakda Maneerot, Department of Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand

Sakda Maneerot received his M.Eng. degree in electrical engineering from the King Mongkut’s Institute of Technology Ladkrabang in 2018. Currently, he pursues his Ph.D at the Electrical Engineering Department, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand. His research activities have been mainly involved with liquid dielectric characteristics and transformer design and testing.

Masaaki Kando, Department of Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand

Masaaki Kando (Fellow IEEJ, Life member IEEE) graduated from the Tokai University, Japan with M.Eng. degree in 1973. He joined the academic staff as an assistant professor of the Department of Electrical Engineering, Tokai University in 1973, lecturer in 1978, associate professor in 1985 and professor in 1992. He was awarded the Doctor of Engineer degree by the Nagoya University in 1991. He received his professor emeritus title from the Tokai University in 2011, has been an IEEE Life Member, IEEJ Fellow and IEEJ Life Member since 2014. He has supported the Malaysia - Japan Higher Education Program as an expert and lecturer under the Malaysian Government, and other Asian universities (Thailand, Cambodia and Laos) in high-voltage engineering. Currently, he is a visiting professor of the KMITL in Thailand.

Norasage Pattanadech, Department of Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand

Norasage Pattanadech received his B.Eng and M.Eng degrees in electrical engineering from the King Mongkut’s Institute of Technology Ladkrabang in 1998 and the Chulalongkom University, Thailand in 2002, respectively. He was also awarded his Ph.D. degree by the Institute of High Voltage Engineering and System Management, Graz University of Technology, Austria in 2013. Currently, he works as an associate professor at the King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand. His research activities have been mainly involved with partial discharge in insulating liquid, solid insulator characteristics and high-voltage testing.

References

Norasage Pattanadech, “Partial discharge inception voltage characteristics of mineral oil”, PhD thesis, Graz University of Technology, 2013

T. K. Saha, “Review of modern diagnostic techniques for assessing insulation condition in aged transformers,” Dielectrics and Electrical Insulation, IEEE Transactions on, vol. 10, pp. 903–917, 2003.

Z. D.Wang, P.A.Crossley, KJ.Cornick, D.H.Zu, “Partial discharge location in power transformers”, Proc. IEE Science, Meas. Tech., Vo1. l47, No. 5, pp. 249–255, 2000.

R.E.James, B.T. Phung and Q.Su, “Application of digital filtering techniques to the determination of partial discharge location in transformers”, IEEE Transactions on Electrical Insulation, Vol. 24, No. 4, pp. 657–668, 1989.Vernon Cooray, “An Introduction to Lightning”, 2015, Springer

N. Pattanadech, Partial Discharge Inception Voltage Characteristics of Mineral Oil, Dissertation, Graz University of Technology, 2013.

CIGRE Working Group A2.35, Experiences in Service with New Insulating Liquids, CIGRE 436, October 2010.

Pukel, G. J., et al., “Power transformers with environmentally friendly and low flammability ester liquids,” CIGRE A2-201, 2012

Martin, D., et al.,” An overview of the suitability of vegetable oil dielectrics for use in large power transformers,” Proc. 5th Annual Euro TechCon, Chester, United Kingdom, 2006.

Dolata, B., et al., “New synthetic ester fluid for the insulation of liquid immersed transformers,” Conference Record of the 2006 IEEE International Symposium on Electrical Insulation, 2006.

Jinhua, H., et al., “Application of Insulating Camellia Oil in High Fire Resistance Transformer,” International Conference on High Voltage Engineering and Application (ICHVE), 2012.

Downloads

Published

2020-08-08

Issue

Section

Smart Innovative Technology for Future Industry and Multimedia Applications